CYG PRS-7367 - Protection Principle

Protection Functions
PRS-7367 189
Table 3.38-2 Output signal
Signal
Description
Str
This is the integrated start signal
Op
This is the integrated operation signal.
Alm
This is the integrated Alarm signal
Dir
This is the Direction result
3.38.2 Protection Principle
The protection function can be enabled or disabled by setting the corresponding SEF_Ena
parameter values as "1" or "0".
The operation of the protection can be described using a module diagram. All the modules in the
diagram are explained in the next sections.
 Direction element
1
&
&
SEF_DirMod=0SET
FLG Forward Direction
SEF_DirMod=1SET
FLG Reverse Direction
3I0>SEF_MinOpCur
FLG
3U0>SEF_MinOpVol
FLG
& Direction Initiation
FLG
Figure 3.38-1 Directional Initiation Logic
The evaluation of the forward directionality is according to the equation:
90 ( CorAng) arg 90 ( CorAng)
jRCA
Ie
o
U
o
    

Or,
-
90 ( CorAng) arg 90 ( CorAng)
j RCA
Ue
o
I
o

    
The evaluation of the backward directionality is according to the equation: